CN101288148A

CN101288148A - High-intensity discharge lamp

Info

Publication number: CN101288148A
Application number: CNA2006800179710A
Authority: CN
Inventors: M·哈克
Original assignee: Koninklijke Philips Electronics NV
Current assignee: Koninklijke Philips NV
Priority date: 2005-05-23
Filing date: 2006-05-17
Publication date: 2008-10-15
Also published as: US20080185967A1; JP4885213B2; JP4959852B2; KR101243684B1; CN103985625B; WO2006126144A3; WO2006126144A2; EP1889283A2; CN103985625A; US7893623B2; KR20080019238A; JP2008542993A; JP2012023055A

Abstract

A high-intensity discharge (HID) lamp comprising an inner bulb (1) with a discharge vessel (11) and an outer bulb (2), especially for application in an automotive headlight unit is disclosed. A lamp design is proposed by which high thermal stresses and increased quartz temperatures during run-up and steady state operation of the lamp are avoided so that the light output and the lifetime of the lamp is improved. This is substantially achieved by a positioning of the inner and the outer bulb (1, 2) such that a longitudinal axis of the inner bulb (1) is displaced in the operating position of the lamp above a longitudinal axis of the outer bulb (2) so that the distance between the discharge vessel (11) and the outer bulb (2) at the top side of the lamp is decreased and the distance between both at the bottom side is correspondingly increased.

Description

High-intensity discharge lamp

Technical field

The present invention relates to a kind of high-intensity discharge (HID) lamp, Nei Pao and Wai Pao that it comprises the belt discharge container are specially adapted to the automobile headlamp unit.

Background technology

High-intensity discharge lamp and particularly those high-intensity discharge lamps that are suggested the headlight unit that is used for vehicle are with high-power operation.In addition, owing to need point source of light so that realize the fact of the radiation characteristic of regulation in certain reflector design, this lamp must have less size.

Usually, this HID lamp is made of interior bubble (its enclose discharge gas and salt filling) and outer bubble or lamp container, described outer bubble or lamp container surround in this bubble with under the situation of interior bubble blast, make on every side parts and avoid impaired and protection in steep and avoid external action.In addition, outer bubble also protects environment to avoid ultraviolet radiation.

This structure has special in the result that may produce high thermal stress during HID lamp start-up operation in interior bubble.In addition because the high temperature that steeps in during steady state operation, salt material that discharge volume contains can be to a great extent with interior bubble wall in the quartz material chemically reactive.This causes the quartz crystals that increases, and the quartz crystals of increase will produce negative influence to the life performance of lamp.

Under the situation of the HID of the discharge gas that comprises no mercury lamp, these problems can be more serious because those lamps usually between the starting period and steady state operation during be supplied than situation at mercury discharge lamp under higher electric current.

EP0 481 702 discloses the heat transfer unit (HTU) that is used for removing from the vitreosil electric arc tube that is used as light source at discharge lamp heat.By come to remove heat by tube wall in the vitreosil projection of inner tubal wall outer surface and the complementary protuberance of in outer tube wall, extending in the projection direction of dimple form in lamp operating period at interior pipe.

Yet, to the tube wall of discharge lamp or bubble wall this supernumerary structure is provided or change need very accurately and widely production method so that the unlikely risk of supervening the relevant tube reduction.

Another shortcoming is such fact, utilizes this projection and/or dimple in interior pipe and/or outer tube wall, and light radiation characteristic can be affected, for example, and about capture-effect.Under the situation that reflector is used, for example, in the headlight unit of automobile, this is especially disadvantageous at lamp, because this can make the degradation significantly that will distribute of the light of institute's radiation.

Summary of the invention

One object of the present invention is to provide a kind of high-intensity discharge lamp, the outer bubble that it comprises the interior bubble that has the discharge vessel that is used to enclose discharge gas and surrounds bubble in this, reduced like this in the startup of this lamp and the thermal stress during the steady state operation, and do not influenced the light radiation characteristic of lamp to a great extent.

Another object of the present invention is to the high-intensity discharge lamp that provides as indicated above, wherein particularly during steady state operation, the value of limited maximum temperature does not influence the light radiation characteristic of lamp to a great extent with the component (especially being the component such as salt material) that prevents to be contained and the quartz material chemically reactive in the interior bubble wall in the filler of discharge vessel.

At last, particularly, will realize these purposes for no mercury HID lamp.

According to claim 1, realize these purposes by a kind of high-intensity discharge lamp, this high-intensity discharge lamp comprises the interior bubble that has the discharge vessel that is used to enclose discharge gas and surrounds the outer bubble of bubble in this, wherein, the longitudinal axis of bubble was arranged in the horizontal service position of this lamp in the longitudinal axis top of bubble will be somebody's turn to do outside, make this discharge vessel with should outside distance between steeping at the upside of this lamp less than downside at this lamp.

Like this, because the heat conduction that promoted in the top side, reduce in the maximum temperature that the top side produced of lamp.

The advantage of this solution is such reality, owing to increase at the downside of the cold spot that is generally lamp or the temperature of bottom side, has improved the efficient of lamp significantly, particularly light output.The temperature of this increase produces by the distance of increase between discharge vessel and the outer bubble with via the corresponding heat conduction that reduces of this distance usually.

Another advantage is, particularly during steady state operation, thereby reduced thermal stress effectively at the cold spot at the wall place of this lamp and the temperature difference between the hottest point.

This has the result who prolongs the lamp life-span, particularly because the reason that the trend of the quartz crystals of the lamp wall that temperature caused that reduces at the hottest point of discharge vessel is lowered or prevents.

Here should should be mentioned that, GB1 562 929 discloses the improvement of the structure of the discharge lamp that is designed to levels operation, and wherein the axis of cylindrical capacitor discharge is arranged to be basically the axis below that vertically is positioned at the external container that surrounds internal container (being drained).Like this, because from the thermal radiation of the varying strength of the top of lamp and bottom, the temperature difference between the different piece of the discharge vessel of this lamp operating period will be reduced.In contrast, in lamp according to the present invention effectively cooling mechanism carry out according to heat conduction with heating mechanism thereby this prior art to be considered be incoherent.

Dependent claims discloses advantageous embodiment of the present invention.

Claim 2 discloses the embodiment of the interior bubble that comprises asymmetrical form.

Embodiment according to claim 3 has the advantage that the cooling in the top side is further promoted.Embodiment hereto, the lamp wall material preferably selects according to claim 4 so that the unlikely life-span that reduces lamp.

Claim 5 and claim 6 have has improved the cooling effectiveness and the therefore advantage that reduces of thermal stress effectively.

Embodiment according to claim 7 is provided for the automobile application especially.

At last, claim 8 discloses the preferred size according to lamp of the present invention.

Description of drawings

Referring to accompanying drawing, from the hereinafter description of preferred embodiment, other details of the present invention, feature and advantage will become apparent, in the accompanying drawings:

Fig. 1 is the signal vertical section of major part that is used for the discharge lamp of levels operation position;

Fig. 2 is according to the schematic vertical section of first embodiment of lamp of the present invention, and

Fig. 3 is the schematic vertical section according to second embodiment of lamp of the present invention.

Embodiment

Fig. 1 has shown the typical construction of high-intensity discharge lamp with vertical section, its start with steady state operation during relate to the problems referred to above.This lamp be provided for levels operation and comprise in pipe or interior bubble 1 and surround the outer tube of bubble 1 in this or bubble or lamp container 2 (its part only is shown) outward.

Interior bubble 1 comprises first core with first diameter d 1 or the discharge vessel 11 that is used to enclose discharge volume.Provide the first elongated pinch part 12 and the second elongated pinch part 13 to be used to enclose the electrode electric contact of (figure does not show) in the axial opposite end of discharge vessel 11, described electrode extends in the discharge vessel 11 and excited gas discharge between described electrode.Interior bubble 1 is had the cylindrical substantially outer bubble 2 of second diameter d 2 and is enclosed.

According to the first embodiment of the present invention that in Fig. 2, shows with the vertical section signal, in bubble or interior pipe 1 in the direction of the upside of this lamp or top side, be disposed in the operating position of this lamp with respect to outer bubble or outer tube 2, thereby the distance between the adjacent wall part of the upper wall portion that makes outer tube 2 and discharge vessel 11 is less than the adjacent wall of the lower wall part of outer tube 2 and discharge vessel 11 distance between partly.

This structure has two basic advantages.By reducing the distance between the quartz bulb 2 and interior quartz bulb 1 outside on the top side of operating position at this lamp of this lamp, can be by increasing heat conduction the high-temperature area of cooling discharge container 11 effectively.Simultaneously, by at the operating position of this lamp in bigger distance between this lamp bottom discharge vessel 11 and the outer quartz bulb 2 owing to pass through the heat conduction that reduces of this bigger distance, the temperature increase of cold spot, and therefore, improved light output significantly.

Interior bubble 1 is with the minimum range in this lamp top side can the realization very simply by the relevant installing device of adjusting at least one bulb in the

bulb

1,2 fully with the ultimate range in this lamp bottom side between the bubble 2 outward.

Preferably, steep 2 outward and be filled with pressure between about 10 millibars of extremely about 1 crust, more preferably the gas between 30 millibars to 800 millibars.Experiment is presented in this pressure limit, and in the temperature range that takes place usually during normal lamp operation, heat conduction is very constant, is best in the selected location between two

bulbs

1,2 under nearly all operating condition therefore.Be lower than at air pressure under 10 millibars the situation, heat conduction significantly reduces.

Preferably, steep gases in 2 outside and comprise at least a material in the following material: humid air, dry air, N ₂, O ₂, H ₂, CO ₂, Ar, Ne, Xe, Kr.

Fig. 3 shows the second embodiment of the present invention, wherein with Fig. 1 and Fig. 2 in corresponding parts and member represent with identical Reference numeral.

According to this embodiment, interior bubble or interior pipe 1 are arranged to the degree of the wall of the outer bubble 2 of discharge vessel 11 contacts with respect to outer bubble or outer tube 2.Like this, the cooling of discharge vessel 11 is further strengthened.Yet,, preferably, steep 2 outward and make by the material that does not contain potassium for fear of damaging bulb 2.

Outside diameter d 1 (for example) according to the discharge vessel 11 of typical lamp of the present invention is preferably about 6mm, especially is about 6.05mm, and outer tube or steep 2 inner diameter d 2 outward for about 6,7mm.According to as lamp filler and steep in 2 outside and pass the special parameter of heat conduction and so on of the wall of outer bubble 2, according to the power of lamp with make the used material of bulb and select interior 1 the degree of steeping with respect to the displacement of outer bubble 2.

At last, as substituting or replenishing to as explained above outer bubble 2 and the displacement relative to each other of interior bubble 1, discharge vessel 11 and particularly its volume can be formed asymmetrically and size also can be asymmetric, make operating position at lamp in the upside or the top side of this lamp, the top of the wall of discharge vessel 11 to the distance of the adjacent wall of outer bubble 2 less than the bottom of the wall of discharge vessel 11 distance to the lower wall of outer bubble 2.

Claims

1. high-intensity discharge lamp, it comprises interior bubble (1) that has the discharge vessel (11) that is used to enclose discharge gas and the outer bubble (2) that surrounds described interior bubble (1), wherein, outside described the longitudinal axis top of bubble (2) will be described in the longitudinal axis of bubble (1) be arranged in the levels operation position of described lamp, make described discharge vessel (11) and described outside steep distance between (2) at the upside of described lamp less than downside at described lamp.

2. high-intensity discharge lamp according to claim 1, wherein said discharge vessel (11) is formed asymmetrically, make the described discharge volume of being enclosed at the operating position of described lamp at the described upside of described lamp than more close described outer steep (2) of the downside of bubble (2) outside described.

3. high-intensity discharge lamp according to claim 1, wherein at the described upside of described lamp, the distance between described discharge vessel (11) and the described outer bubble (2) is zero.

4. high-intensity discharge lamp according to claim 3, wherein said discharge vessel (11) does not contain potassium with the wall material of described outer bubble (1).

5. high-intensity discharge lamp according to claim 1, wherein said outer bubble (1) are filled with pressure limit at the about 10 millibars gases between clinging to about 1.

6. high-intensity discharge lamp according to claim 5, wherein said gas comprise at least a material in the following material: humid air, dry air, N ₂, O ₂, H ₂, CO ₂, Ar, Ne, Xe, Kr.

7. high-intensity discharge lamp according to claim 1, wherein said discharge gas is not mercurous.

8. high-intensity discharge lamp according to claim 1, the external diameter (d1) of wherein said discharge vessel (11) is about 6mm, and the internal diameter (d2) of described outer bubble (2) is about 6,7mm.

9. headlight unit especially for vehicle, it comprises according to each described high-intensity discharge lamp in the claim 1 to 8.